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  <title>Raise number into power</title>
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  <div id="layout-content"><div id="function.gmp-pow" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gmp_pow</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_pow</span> &mdash; <span class="dc-title">Raise number into power</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.gmp-pow-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gmp_pow</strong></span>
    ( <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$base</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$exp</code></span>
   ) : <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>

  <p class="para rdfs-comment">
   Raise <code class="parameter">base</code> into power <code class="parameter">exp</code>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gmp-pow-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">base</code></dt>

     <dd>

      <p class="para">
       The base number.
      </p>
      <p class="para">可以是一个 GMP
数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p> 
     </dd>

    
    
     <dt>
<code class="parameter">exp</code></dt>

     <dd>

      <p class="para">
       The positive power to raise the <code class="parameter">base</code>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gmp-pow-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The new (raised) number, as a GMP number. The case of 
   <em>0^0</em> yields 1.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gmp-pow-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4090">
    <p><strong>Example #1 <span class="function"><strong>gmp_pow()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$pow1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"2"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">31</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$pow2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"0"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$pow3&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"2"</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;Negative&nbsp;exp,&nbsp;generates&nbsp;warning<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow3</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
2147483648
1
</pre></div>
    </div>
   </div>
  </p>
 </div>


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